Straight pull tool jar



May 7, 1940. E. c. HAMM STRAIGHT PULL TOOL JAR Filed March 6, 1959 77v67ZZZf 4704) 6.2/ 20,

v Patented May 7, 1940 UNITED' 'STATES PATENT OFFICE g 2,199,959 STRAIGHT PULL TOOL JAR :Edward C. Hamm, Norwalk, Calif -ApplicationMarch 6, 1939, Serial No. 259,9$l1- 4 Claims.

1. latches on the shoulder the collar is repressed until the toes close in enoughto ride past the shoulder and be'pulled up by the hammer. This involves a reverse motion of the collar as to the motion of the hammer and the latches when they are free. I

It is an object of the invention here exhibited to materially simplify the release action of the said Shaffer jar tool and to still employ the same basic principle of a set of latches held to a friction shoulder and which are directly active against a pressure collar as in the Shafier patent but which act to push the trip collar in the same direction as the tension effort and while travelling with the tension member as an element of a tension assembly and are always undera direct load of a spring pressed collar.

' The invention consists in certain advancements in this art as set forth in the ensuing disclosure and having, with the above, additional objects and advantages as hereinafter developed, and whose construction, combinations and details of means, and the manner of operation will be made manifest in the description of the herewith illustrative embodiments; it being understood that modifications, variations and adaptations may be resorted to within the spirit, scope and principle of the invention as it is more directly claimed hereinbelow.

Figure l is an axially sectioned elevation of a form of the jar in fish-anchored, set position ready for striking a jar blow.

Figure 2 is a sectional elevation of the same tool provided with self-contained means for regulating the release tension of the tool.

Figure 3 is a cross-section of inner splined elements fitting a wash pipe.

A purpose is to provide a jar tool of as few and as simple parts, and as direct and efiective action as possible and to that object the jar here includes a bottom pin or other means 2 for securing to any desired combination of elements or implements as may be used therebelow, as, for instance, a fishing tool.

The pin. has internalv threads 3 to receive the threaded end of a mandrel shank 4 having an enlarged, medial piston 5 slidably fitting a lower shell or barrel 6. The lower end of the barrel 6 has a bushing 1 splined 9.? to the mandrel 4 and its upper end forms-a hammer to impinge the 1 lower shoulder face of the piston 5 when the bar- 5 rel 6 is permitted to snap upward by tension of or on an'upper shell or jacket part ll] threaded at H onto the barrel and having at its top a suitable joint section 12 attachable to a suitable tool or other string S. r

Means are provided whereby to releasably lock the hammer bushing l in down-spaced position from the anvil piston 5 until such a tension has been-setup in the string S as is desired.

The barrel 6 here has itsv upper end concaved at 6a ,to form a seat for anannular series of tumblers 13 whose upper ends are under constant in-thrust action, of a ring l4 having a bottom cam edge I5 to, effect such thrust action on the tumbers.

The ring l4 slidably fits a head 4a, of the mandrel, having an out-bevelled shoulder 4b engaged by the rounded upper ends of the tumblers I3. Thus the upper ends of the tumblers rest in the re-entrant angle between theannular cam edge l5 and the peripheral, conical shoulder 4b of the mandrel 4. The mandrel and its afixed 1portions may be considered the anvil part of the The ring M has an in-turned flange [4a superjacent a rim shoulder of the head 4a and telescopes on the upwardly extending wash pipe I! fixed in the piston 4a. The ring is constantly thrust down onto the tumblers l3 by a control spring l8, Fig. l, or springs l8l9, Fig. 2, where-- by to keep the tumblers inward under the friction shoulders 42) until such a tension is placed on the shell jacket 10, while the mandrel is anchored, that the tumblers l3 will be wedged outward by the shoulder 4b and will overcome the pressure of the ring 14 and will force it upward on the head 4a.

As soon as the tumblers clear the side of the head 4a the tension of the string S upward of the barrel 6 causes the barrel to jerk the hammer l sharply against the anvil face of the piston 5. After string tension is thus released the string and the hammer are again lowered from envil 5 and the control spring I8 expands and the ring 14 again tips the tumblers l3 into locking position under the friction shoulder 4b.

It will be seen that this is a much simplified jar over that of the said Shaffer patent and the releasing and the re-setting of the tool is effected in an easier, more direct and reliable manner.

In Fig. 2 a means is provided to adjust the spring or springs by relative rotation of an upper part of the string S as to the shell jacket l0 while this is held against rotation, as while held to a fish or other object below the jacket and hammer I which is splined at 8 to the mandrel-anvil part 4-5. This means includes a hollow screw 20 turnably receiving the wash pipe I! and threaded at 2| into the upper end of the jacket l0 and having thrust bearing seat 22 for the upper end of the spring device |8-|9.

The screw 20 is splined at 23 in an elongate nipple 24 attached at its upper end to a box or drive joint 25 havingrclutch jaw ends 26 to be lowered into turning drive connection with complementary jaws 2'! on an intermediate sleeve 28 for rotation of the mandrel and subjoined elements when desired.

When the string joint 25 is pulled up enough to disengage the jaws 26 from the jaws 2'! the string can be turned without turning the mandrel. Further lift of the joint 25 will bring a set of jaws 24a of the nipple 24 into mesh with an internal ring of jaw teeth 28 on the sleeve 28 which threads onto the jacket ID by screw 30.

It will be seen that the combination provides for turning the mandrel while fish-engaged; for lift and turn of upper parts free of the mandrel, and for string turn to adjust the intensity of the string tension as determined by set of the control spring |8-I9 against the string locking, tumbler ring.

What is claimed is:

l. A well jar tool having, in combination, splined hammer and anvil parts, the anvil part having a friction shoulder, a set of tumblers having ends to engage the shoulder and the hammer part supporting the opposite ends, a trip control spring in the hammer part constantly act-' ing on the tumblers to press them under said shoulder; said shoulder reacting on the tumblers to trip them out of engagement when predeterminedtension is placed on the hammer and anvil parts, and means for. varying the reaction of splined to the anvil part, a set of cam-end tumblers pivoted on end in and by the hammer part,

a shoulder on the anvil part, a cam ring slidably mounted between the said parts and engaging cam faces of rand-tilting the tumblers toward said shoulder, and a control spring seated on said ring and on the hammer part; said shoulder operative to dislodge the tumblers and thereby repress the cam ring under'a predetermined tension betweenthe parts. g Y.

4. In a jar tool, a'pair of relatively telescopic parts one-of which has an annular trip shoulder, a cam ring interposed between one of the parts and the rim of said shoulder and forming therewith a re-entrant, annular seat, an annular set of tumblers having cam ends abutting said ring and engaging in the said seat on the one part and pivotally mounted on the other part, and control spring reacting between the said ring and one of the parts to force the tumblers yieldably to the seat, and said shoulder'operative to dislodge the tumblers and repress the ring there- J by when the load of the spring reactionis negatived; the said parts being provided with opposed hammer and anvilfaces to 'efiect a'jar function produced by tension between the parts.

EDWARD c. i l; 

